Getting started w/Angular 2 alpha.52 & TypeScript 1.7+

Jim Cummins

@JimTheDev

Developer at Fisdap

Author of Commitizen

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GitHub/Twitter: @JimTheDev

Did everyone get food?  Thank the sponsors!

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Timeline

Intro

TypeScript

Angular 2

Q&A

10 min

10 min

25 min

10 min

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What we won't cover

Angular 1 to 2 migration

Animations

i18n (internationalization)

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Services (now called Providers)

Form Building (2-way binding)

Advanced TypeScript

Routing

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<people>
  <person>Jim</person>
  <person>Mira</person>
  <person selected>Annabelle</person>
</people>

HTML

Web in 1996: Documents

CSS

[selected] {
  font-weight: bold;
}

Jim

Mira

Annabelle

Output

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Web in 2015: Applications

<pets>
  <pet>June</pet>
  <pet>Kitteh</pet>
  <pet selected>Shanti</pet>
</pets>

What if, in the same page I want selected pet to be underlined?

CSS

[selected] {
  text-decoration: underline;
}

HTML

June

Kitteh

Shanti

Output

Why is Shanti bolded and underlined?

  • CSS rules are global!
  • We need encapsulation
  • Angular 2 uses Web Components

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Applications as a rat's nest of components

events

data

App

Person

Pet

People

List

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(output)

(input)

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Infinite  loop

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Applications as a component tree

event

App

PetList

Person
List

Pet

Pet

Person

Person

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data

(output)

(input)

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Uni-directional Data flow

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TypeScript

JavaScript

+ Types

=

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Why use TypeScript?

Better overall code readability in large codebases

Ease of refactoring

IntelliSense auto suggest in code editors

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Use new ES6 features in older browsers

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JavaScript

TypeScript

Superset

TypeScript:

Compiles TypeScript to Javascript (or shows errors)

Analyzes code to help IDEs/Editors

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Hello, Annabelle!

var name = 'Annabelle';

console.log('Hello, ' + name + '!'); 
// > Hello, Annabelle!
var name: string = 'Annabelle';

console.log('Hello, ' + name + '!');
// > Hello, Annabelle!

JavaScript

TypeScript

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Classes

class Person {
    constructor(name) {
        this.name = name;
    }
    greet() {
        return 'My name is ' + this.name;
    }
}

var annabelle = new Person('Annabelle');

console.log(annabelle.greet());
// > My name is Annabelle

JavaScript (ES6)

class Person {
    constructor(public name: string) { }
    greet(): string {
        return 'My name is ' + this.name;
    }
}

var annabelle = new Person('Annabelle');

console.log(annabelle.greet());
// > My name is Annabelle

TypeScript

How do we add

types using TypeScript?

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Interfaces

class Person {
    constructor(public name: string) { }
    greet(): string {
        return 'My name is ' + this.name;
    }
}

var annabelle = new Person('annabelle');

console.log(annabelle.greet());
// > My name is Annabelle

TypeScript

interface Greets {
  greet(): string;
}

class Person implements Greets {
    constructor(public name:string) { }
    greet():string {
        return 'My name is ' + this.name;
    }
}

var annabelle = new Person('Annabelle');

console.log(annabelle.greet()); 
// > My name is Annabelle

TypeScript with Interfaces

What if we want

multiple entities to

be able to greet in

different ways?

interface Greets {
  greet(): string;
}

class Robot implements Greets {
    constructor(public id:string) { }
    greet():string {
        return this.id + ' REPORTING IN';
    }
}

var robbie = new Robot('MD-80');

console.log(robbie.greet()); 
// > MD-80 REPORTING IN

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Modules

class Person {
    constructor(public name: string) { }
    greet() {
        return 'My name is ' + this.name;
    }
}
export class Person {
    constructor(public name: string) { }
    greet() {
        return 'My name is ' + this.name;
    }
}
var annabelle = new Person('Annabelle');

console.log(annabelle.greet());
// > My name is Annabelle

person.ts

app.ts

Error! Person is undefined. (app.ts:1:9)

 

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import {Person} from './person';

Error! './person' has no export 'Person'. (app.ts:1:9)

Success

 

 

TypeScript Log

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How to install TypeScript?

  1. Install Git
     
  2. Install Node.js v0.12 or greater
     
  3. Install TypeScript by running:
npm install -g typescript tsd

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Which editors support TypeScript?

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Adobe Brackets

Sublime Text

Microsoft Visual Studio Code

JetBrains
Editors

GitHub
Atom

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TypeScript in your development pipeline.

  • Command line
  • IDE / Editors
  • Gulp / Grunt
  • Webpack / SystemJS

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Angular 2

=

Components

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Start with a class

A Basic Component

export class Person {}
import {Component} from 'angular2/angular2';

@Component({
  selector: 'person',
  template: `
    <hair>Black</hair>
    <eyes>Brown</eyes>
  `
})
export class Person {}
import {Component} from 'angular2/angular2';

@Component({
  selector: 'person',
  template: `
    <hair>Black</hair>
    <eyes>Brown</eyes>
  `,
  styles: `
    hair { height: 150px; }
    eyes { border-radius: 50%; }
  `
})
export class Person {}
import {Component} from 'angular2/angular2';

@Component({
  selector: 'person'
})
export class Person {}

Add a selector.

Add a template.

<person>

Usage

Selector

person
people-list
<people-list>

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Add CSS styles

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So what did we gain?

import {Component} from 'angular2/angular2';

@Component({
  selector: 'person',
  template: `
    <hair>Black</hair>
    <eyes>Brown</eyes>
  `,
  styles: `
    hair { height: 150px; }
    eyes { border-radius: 50%; }
  `
})
export class Person {}

explicit dependencies

clear external API

an internal structure composed from  other components

ability to visually style direct children

a place to define internal functionality

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Umm...wait a minute...

import {Component} from 'angular2/angular2';

@Component({
  selector: 'person',
  template: `
    <hair>Black</hair>
    <eyes>Brown</eyes>
  `,
  styles: `
    hair { height: 150px; }
    eyes { border-radius: 50%; }
  `
})
export class Person {}

We said one benefit of components is...

an internal structure composed from  other components.

Hair and eyes are not components...yet.

import {Component} from 'angular2/angular2';
import {HairComponent} from '../hair/hair.component';
import {EyesComponent} from '../eyes/eyes.component';

@Component({
  selector: 'person',
  directives: [
    HairComponent,
    EyesComponent
  ],
  template: `
    <hair [color]="'black'"></hair>
    <eyes [color]="'brown'"></eyes>
  `,
  styles: `
    hair { height: 150px; }
    eyes { border-radius: 50%; }
  `
})
export class Person {}

Import child components

Tell Person component about children components

Much better

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[square] html attributes?!?

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Data

flows down,

App

Person

Hair

Eyes

@Component({

// ...snip...

  template: `
    <hair [color]="'black'"></hair>
    <eyes [color]="'brown'"></eyes>
  `
})

...snip...
export class Person {}

event

data

(user input)

(visual output)

into

components

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Handling user interaction

@Component({

// ... snip

  template: `
    <hair [color]="'black'"></hair>
    <eyes [color]="'brown'" (blink)="blinked($event)">
    </eyes>
  `,
  styles: `
    hair { height: 150px; }
    eyes { border-radius: 50%; }
  `
})
export class Person {
  blinked(eyeColor: string) {
    console.log(eyeColor); // 'brown'
  }
}

Interactions trigger events

Components may handle events from their children.

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Events

flow up,

App

Person

Hair

Eyes

@Component({

//...snip...

  template: `
    <hair [color]="'black'"></hair>
    <eyes [color]="'brown'"
          (blink)=blinked($event)
          ></eyes>
  `
})

...snip...
export class Person {}

event

data

Out

of components

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Eyes should blink when clicked

import {Component} from 'angular2/angular2';

@Component({
  selector: 'eyes',
  outputs: ['blink'],
  inputs: ['color'],
  template: `
    <eye (click)="blink(color)"></eye>
    <eye (click)="blink(color)"></eye>
  `
})
export class EyesComponent {}

 

Components emit 
output events up to their parent components.

 

Detect a click, then call blink(), passing it color

But where do blink and color come from?

../eyes/eyes.component.ts

 

Components receive
inbound data passed down from their 
parent.

 

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Play with Angular2 today

git clone https://github.com/pkozlowski-opensource/ng2-play

Get an example project

Set it up

npm i -g gulp
npm i

Run it

gulp play

See it

Browse to: http://localhost:9000

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Thank you!

Learning

angular.io

github.com/angular-class/angular2-webpack-starter

github.com/angular-class/awesome-angular2

Questions?

github.com/pkozlowski-opensource/ng2-play

github.com/shprink/angular2-nobullshit-boilerplate

blog.thoughtram.io

Starter projects

Community

gitter.im/angular/angular

angularmn-slack.herokuapp.com

angularbuddies.com

JimTheDev on most sites

JimTheDev@gmail.com

Contact me

Jim Cummins

Getting started with Angular 2 and Typescript

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